I took my Sony MD/CD changer head unit in for repair after the front left
channels kept cutting out - they replaced a faulty socket on the rear and
solved the problem.

Only thing is now when I switch off the car the head unit's setting are
erased, i.e. clock, bass/treble, display etc, AND it no longer restarts at
the same point on a CD but restarts at CD 1 Track 1 every time, or ejects
the MD when you switch the unit back on.

I assume that some contact that kept the HU powered when the car is off has
not been reconnected - I'm obviously going to take it back in for them to
sort out, but is this an easy thing to fix?

Thanks

Alex